This post will graphically prove a JFK conspiracy based on a probability analysis of the deaths o witnesses who testified or were sought to testify in four investigations in 1964-1978. It compares the statistically expected number of unnatural deaths (based on published mortality rates) to the actual number. The data and probabilities are displayed in JFK Calc: A Spreadsheet/Database of Mysterious Witness Deaths.
There were at least 62 suspicious deaths among approximately 1100 witnesses who were called to testify at the 1964 Warren Commission, 1969 Garrison/Shaw trial, 1975 Church Senate and 1977 HSCA investigation. At least 38 were unnatural (27 homicides). Only 14 unnatural deaths would have been expected statistically. Using the 0.000206 weighted unnatural death rate, the probability is 1 in 1 trillion trillion.

There were at least 29 suspicious deaths among the 552 witnesses who testified at the Warren Commission. At least 20 died unnaturally. Only 7 unnatural deaths would have been expected statistically. The probability of at least 20 unnatural deaths is 1.78E-18 or 1 in 500,000 trillion.